Permeability (electromagnetism) Guide, Meaning , Facts, Information and Description

In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field. Absolute permeability is represented by the symbol μ. In SI units, permeability is measured in henryss per metre.

where

μ is the permeability, measured in henry per metre

B is the magnetic flux density (also called the magnetic induction) in the material, measured in tesla

H is the magnetic field strength, measured in ampere per metre

Absolute permeability

Absolute permeability is represented by the symbol μ₀; and is the permeability of the vacuum, where μ₀ = 4π × 10⁻⁷ N A⁻² (exactly).

Together with permittivity, permeability defines the speed of light.

Relative permeability

Relative permeability, sometimes denoted by the symbol μ_r, is the ratio of the permeability of a specific medium to the permeability of free space μ₀:

Relative permeability for some materials
Medium
Hydrogen	0.008 × 10-6
Copper	−6.4 × 10-6
Water	−8.0 × 10-6
Aluminium	22.2 × 10-6
Platinum	265 × 10-6

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